/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.plugin.task.java;

import java.io.File;
import java.util.jar.JarFile;
import java.util.jar.Manifest;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class MainClassExtractor {

    private MainClassExtractor() {
    }
    public static String getMainClassName(String jarFilePath) {
        String mainClassName = null;
        try (JarFile jarFile = new JarFile(new File(jarFilePath))) {

            Manifest manifest = jarFile.getManifest();
            mainClassName = manifest.getMainAttributes().getValue("Main-Class");

        } catch (Exception e) {
            throw new RuntimeException("get mainJarName failed:", e);
        }
        return mainClassName;
    }
}
